This web viewer provides a map of waterbodies in Oregon, Washington, and Wyoming. Oregon and Washington outputs consist of waterbodies within 1 mile of a Forest Service recreation site and Wyoming outputs contain all named waterbodies on FS lands.
There are two layers in this viewer, 1) USFS Waterbodies and 2) Algal Bloom Z-Score which are described below:
1. USFS Waterbodies is color coded to show a waterbody’s status as either algal-positive (red) or algal-negative (blue) for any month between May and September of 2021. Any waterbody that shows up as red in the USFS Waterbodies layer had at least 5% of its pixels detected as algal blooms during at least one month. Clicking on a waterbody will display more information about when this event occurred.
2. The Algal Bloom Z-Score layer shows more detailed information about the spatial distribution of algal bloom events within all waterbodies in each state. By comparing each waterbody to a set of algal-negative lakes, the 80th percentile of z-scores for each pixel, between May and September of 2021, is used to show the maximum algal bloom z-score value, while ignoring outliers and falsely high numbers.
